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Diffraction-limited storage-ring vacuum technology.

Al Dmour, Eshraq LU ; Ahlbäck, Jonny LU ; Einfeld, Dieter LU ; Fernandes Tavares, Pedro LU and Grabski, Marek LU (2014) In Journal of Synchrotron Radiation 21(Pt 5). p.878-883
Abstract
Some of the characteristics of recent ultralow-emittance storage-ring designs and possibly future diffraction-limited storage rings are a compact lattice combined with small magnet apertures. Such requirements present a challenge for the design and performance of the vacuum system. The vacuum system should provide the required vacuum pressure for machine operation and be able to handle the heat load from synchrotron radiation. Small magnet apertures result in the conductance of the chamber being low, and lumped pumps are ineffective. One way to provide the required vacuum level is by distributed pumping, which can be realised by the use of a non-evaporable getter (NEG) coating of the chamber walls. It may not be possible to use crotch... (More)
Some of the characteristics of recent ultralow-emittance storage-ring designs and possibly future diffraction-limited storage rings are a compact lattice combined with small magnet apertures. Such requirements present a challenge for the design and performance of the vacuum system. The vacuum system should provide the required vacuum pressure for machine operation and be able to handle the heat load from synchrotron radiation. Small magnet apertures result in the conductance of the chamber being low, and lumped pumps are ineffective. One way to provide the required vacuum level is by distributed pumping, which can be realised by the use of a non-evaporable getter (NEG) coating of the chamber walls. It may not be possible to use crotch absorbers to absorb the heat from the synchrotron radiation because an antechamber is difficult to realise with such a compact lattice. To solve this, the chamber walls can work as distributed absorbers if they are made of a material with good thermal conductivity, and distributed cooling is used at the location where the synchrotron radiation hits the wall. The vacuum system of the 3 GeV storage ring of MAX IV is used as an example of possible solutions for vacuum technologies for diffraction-limited storage rings. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Synchrotron Radiation
volume
21
issue
Pt 5
pages
878 - 883
publisher
Wiley-Blackwell
external identifiers
  • pmid:25177979
  • wos:000341687000005
  • scopus:84912003478
ISSN
1600-5775
DOI
10.1107/S1600577514010480
language
English
LU publication?
yes
id
a3f5603b-d502-4632-87d9-90e91ab08b24 (old id 4692662)
date added to LUP
2014-10-06 20:19:11
date last changed
2017-04-02 03:18:32
@article{a3f5603b-d502-4632-87d9-90e91ab08b24,
  abstract     = {Some of the characteristics of recent ultralow-emittance storage-ring designs and possibly future diffraction-limited storage rings are a compact lattice combined with small magnet apertures. Such requirements present a challenge for the design and performance of the vacuum system. The vacuum system should provide the required vacuum pressure for machine operation and be able to handle the heat load from synchrotron radiation. Small magnet apertures result in the conductance of the chamber being low, and lumped pumps are ineffective. One way to provide the required vacuum level is by distributed pumping, which can be realised by the use of a non-evaporable getter (NEG) coating of the chamber walls. It may not be possible to use crotch absorbers to absorb the heat from the synchrotron radiation because an antechamber is difficult to realise with such a compact lattice. To solve this, the chamber walls can work as distributed absorbers if they are made of a material with good thermal conductivity, and distributed cooling is used at the location where the synchrotron radiation hits the wall. The vacuum system of the 3 GeV storage ring of MAX IV is used as an example of possible solutions for vacuum technologies for diffraction-limited storage rings.},
  author       = {Al Dmour, Eshraq and Ahlbäck, Jonny and Einfeld, Dieter and Fernandes Tavares, Pedro and Grabski, Marek},
  issn         = {1600-5775},
  language     = {eng},
  number       = {Pt 5},
  pages        = {878--883},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Synchrotron Radiation},
  title        = {Diffraction-limited storage-ring vacuum technology.},
  url          = {http://dx.doi.org/10.1107/S1600577514010480},
  volume       = {21},
  year         = {2014},
}